19 terms

# Geometry 6.1-6.3

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Tangent Conjecture
A tangent to a circle is perpendicular to the radius drawn to the point of tangency
Tangent Segment Conjecture
Tangent segments to a circle from a point outside the circle are congruent
Chord Central Angles Conjecture
If two chords in a circle are congruent, then they determine two central angles that are congruent
Chord Arcs Conjecture
If two chords in a circle are congruent, then their intercepted arcs are congruent
Perpendicular to a Chord Conjecture
The perpendicular from the center of a circle to a chord is the bisector of the chord
Chord Distance to Center Conjecture
Two congruent chords in a circle are equidistant from the center of the circle
Perpendicular Bisector of a Chord Conjecture
The perpendicular bisector of a chord passes through the center of the circle
Inscribed Angle Conjecture
The measure of an angle inscribed in a circle is one-half the measure of the intercepted arc
Inscribed Angles Intercepting Arcs Conjecture
Inscribed angles that intercept the same arc are congruent
Angles Inscribed in a Semicircle Conjecture
Angles inscribed in a semicircle are right angles
The opposite angles of a cyclic quadrilateral are supplementary
Parallel Lines Intercepted Arcs Conjecture
Parallel lines intercept congruent arcs on a circle
Tangent Circles
Circles that are tangent to the same line at the same point. They can be internally tangent or externally tangent.
Internally Tangent Circles
Two tangent circles having centers on the same side of their common tangent
Externally Tangent Circles
Two tangent circles having centers on opposite sides of their common tangent
Central Angle
An angle whose vertex is the center of the circle
Inscribed Angle
An angle whose vertex lies on the circle and its sides are chords